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Do you distinguish between video distributors, picture splitters, matrices, and extenders?
Do you know what the role of video splitters, picture splitters, and matrices are each? Today Xiao Bian gave everyone a detailed introduction to their respective differences.
Video distributor
A video distributor is a device that evenly distributes a source into multiple video signals.
All the video signals correspond to a monitor or video recorder. If you want to send the images of one camera to multiple administrators, you are advised to select the video distributor because the attenuation of the parallel video signal is large and the impedance is not given after multiple output devices are sent to the video. For matching and other reasons, the image will be seriously distorted and the lines will be unstable.
In addition to impedance matching, the video distributor also has video gain, so that the video signal can be sent to multiple output devices at the same time without affecting the video signal, thereby ensuring the synchronization of video transmission to a certain extent. But for the transmission of long-distance coaxial cable Branches have no practical effect.
For example, the video signal collected by the front-end camera can be connected to the central matrix through the video distributor, and then connected to a hard disk recorder or display device. Video distributors usually have 1 input 2 outputs (ie 1 in 2 out), 1 in 4 out, 1 in 8 out and so on. Common video distributors also have 4 in 8 out, 16 in 32 out and many other models.
Video switcher
TV monitor system display part includes video switcher, monitor guide. The function of the video switcher is to switch, repeat, process and copy the image signals transmitted by the system. It can automatically or manually control multiple video signals so that one monitor can monitor multiple camera signals.
Video matrix
The video matrix refers to an electronic device that outputs m video signals arbitrarily to an n-channel monitoring device through an array switching method. Under normal circumstances, the matrix input is greater than the output, ie, m>n. Some video matrices also have audio switching capabilities that enable the simultaneous switching of video and audio signals. This matrix is ​​also called video and audio matrix. The current video matrix has two major categories: analog matrix and digital matrix. Video matrix is ​​generally used for various monitoring occasions.
If you have 70 cameras, but only 7 monitors, then the matrix allows your monitor to cycle through 70 camera views.
In short, matrix host is mainly used with the video wall to complete the screen switching function. But the common matrix input (connected to the camera) is a multiple of 16, the output (connected to the monitor) is a multiple of 4; the United States AD matrix is ​​the originator of the video switching matrix, the industry's first video switching matrix from AD, so far The analog video switching matrix in the market is basically referring to the circuit design and architecture of the AD matrix.
Input devices of analog video matrix: surveillance cameras, high-speed cameras, screen processors, and many other devices, display terminals, general monitors, video walls, splicing screens, etc. (usually a lot of video matrix input, generally dozens of ways to several thousand channels of video, The output is relatively small and generally 2-128 displays; for example, 64 in and 8 out, 128 in and 16 out, 512 in and 32 out, 1024 in and 48 out, etc.).
In the conference, input devices such as AV matrix, VGA, RGB matrix, HDMI matrix, and DVI matrix are commonly used: cameras, DVDs, VCRs, physical booths, desktop computers, and many notebook signals, and display devices: projectors, plasmas, etc. Splicing screens, large-screen displays, etc. (usually the input and output are almost the same, not too much; for example, 8 in 8 out, 16 in 8 out, 16 in 16 out).
Video matrix is ​​to switch the video image from any input channel to any output channel display. In general, an M×N matrix means that it can support both M channels of image input and N channels of image output. That is, any one input and any one output.
Screen divider
Screen splitter, also known as a monitor splitter, is available in four, nine, or 16 partitions. It can display 4, 9, or 16 camera images on one monitor at the same time, or it can be sent to a recorder for recording. . Quadrisection is one of the most commonly used devices, and its performance and price ratio are also better. The quality and continuity of the image can meet most of the requirements. Nine and sixteen segments are more expensive, and the resolution and continuity of each image after segmentation are reduced, and the video is not good. There are also six-, eight-, and quad-segment devices, but the image ratio, sharpness, and continuity are not ideal. The market usage rate is very low. Most splitters can display single images in addition to images. , You can superimpose time and characters, set automatic switching, and even alarm equipment.
The role of the screen divider is as its name implies, it divides the whole screen of the monitor so that it can simultaneously monitor the different screens provided by the multi-camera on the same screen. Generally, there are four, six, eight, nine, twelve, and sixteen screens. The splitter, which is also active, feeds the input N-channel signals into an N-split one-split screen for the monitor, and we can see N small screens on the monitor screen.
Extender
Extender is used to extend the signal device, usually used for long-distance direct connection wire can not meet the transmission requirements of the situation, generally in order to ensure that the signal long-distance transmission without attenuation designed, it is mostly active.
The extender is generally divided into a sending end and a receiving end. The sending end is responsible for performing the functions of signal acquisition and compression. The receiving end is responsible for completing signal decoding and port allocation. In order to achieve the best quality of the signal, there is usually an independent adjustment of the gain or other parameters on an independently powered device. Between the sending and receiving end can be coaxial cable, twisted pair (network cable), or even optical fiber, etc., depending on the application of the device.